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Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)

Dirac materials exhibit intriguing low-energy carrier dynamics that offer a fertile ground for novel physics discovery. Of particular interest is the interplay of Dirac carriers with other quantum phenomena such as magnetism. Here we report on a two-magnon Raman scattering study of AMnBi(2) (A=Ca, S...

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Autores principales: Zhang, Anmin, Liu, Changle, Yi, Changjiang, Zhao, Guihua, Xia, Tian-long, Ji, Jianting, Shi, Youguo, Yu, Rong, Wang, Xiaoqun, Chen, Changfeng, Zhang, Qingming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5172363/
https://www.ncbi.nlm.nih.gov/pubmed/27982036
http://dx.doi.org/10.1038/ncomms13833
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author Zhang, Anmin
Liu, Changle
Yi, Changjiang
Zhao, Guihua
Xia, Tian-long
Ji, Jianting
Shi, Youguo
Yu, Rong
Wang, Xiaoqun
Chen, Changfeng
Zhang, Qingming
author_facet Zhang, Anmin
Liu, Changle
Yi, Changjiang
Zhao, Guihua
Xia, Tian-long
Ji, Jianting
Shi, Youguo
Yu, Rong
Wang, Xiaoqun
Chen, Changfeng
Zhang, Qingming
author_sort Zhang, Anmin
collection PubMed
description Dirac materials exhibit intriguing low-energy carrier dynamics that offer a fertile ground for novel physics discovery. Of particular interest is the interplay of Dirac carriers with other quantum phenomena such as magnetism. Here we report on a two-magnon Raman scattering study of AMnBi(2) (A=Ca, Sr), a prototypical magnetic Dirac system comprising alternating Dirac carrier and magnetic layers. We present the first accurate determination of the exchange energies in these compounds and, by comparison with the reference compound BaMn(2)Bi(2), we show that the Dirac carrier layers in AMnBi(2) significantly enhance the exchange coupling between the magnetic layers, which in turn drives a charge-gap opening along the Dirac locus. Our findings break new grounds in unveiling the fundamental physics of magnetic Dirac materials, which offer a novel platform for probing a distinct type of spin–Fermion interaction. The results also hold great promise for applications in magnetic Dirac devices.
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spelling pubmed-51723632016-12-23 Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2) Zhang, Anmin Liu, Changle Yi, Changjiang Zhao, Guihua Xia, Tian-long Ji, Jianting Shi, Youguo Yu, Rong Wang, Xiaoqun Chen, Changfeng Zhang, Qingming Nat Commun Article Dirac materials exhibit intriguing low-energy carrier dynamics that offer a fertile ground for novel physics discovery. Of particular interest is the interplay of Dirac carriers with other quantum phenomena such as magnetism. Here we report on a two-magnon Raman scattering study of AMnBi(2) (A=Ca, Sr), a prototypical magnetic Dirac system comprising alternating Dirac carrier and magnetic layers. We present the first accurate determination of the exchange energies in these compounds and, by comparison with the reference compound BaMn(2)Bi(2), we show that the Dirac carrier layers in AMnBi(2) significantly enhance the exchange coupling between the magnetic layers, which in turn drives a charge-gap opening along the Dirac locus. Our findings break new grounds in unveiling the fundamental physics of magnetic Dirac materials, which offer a novel platform for probing a distinct type of spin–Fermion interaction. The results also hold great promise for applications in magnetic Dirac devices. Nature Publishing Group 2016-12-16 /pmc/articles/PMC5172363/ /pubmed/27982036 http://dx.doi.org/10.1038/ncomms13833 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Zhang, Anmin
Liu, Changle
Yi, Changjiang
Zhao, Guihua
Xia, Tian-long
Ji, Jianting
Shi, Youguo
Yu, Rong
Wang, Xiaoqun
Chen, Changfeng
Zhang, Qingming
Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title_full Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title_fullStr Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title_full_unstemmed Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title_short Interplay of Dirac electrons and magnetism in CaMnBi(2) and SrMnBi(2)
title_sort interplay of dirac electrons and magnetism in camnbi(2) and srmnbi(2)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5172363/
https://www.ncbi.nlm.nih.gov/pubmed/27982036
http://dx.doi.org/10.1038/ncomms13833
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